Induction-motor.



T. ABTMEYER.

l INDUCTION MOTOR. ArPLIoATIoH FILED JULY 1a, 1907.

Patented May 11, 1909.

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THEODORE ABTMEYER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATIONOF PENNSYLVANIA.

' INDUCTION-MOTOR.

Specification of Letters Patent.

Patented May *11, 1909.

To @Il whom it may concern:

Be it knowrrthat I, THEoiJoRE ABTMEYER, a citizen of the United States, and a resil dent of Wilkinsbur, in the county of Allegheny and State o Pennsylvania, have invented a new and useful Improvement in Induction-Motors, of which the following is a specification.

y invention relates to dynanio-electric machines and ithas special reference to in'- duction motors the secondary members of which are provided with windings of the socalled `squirrel-cage type.v The object of my invention is to provide an improved construction forthe secondary members of machines. of the class vabove inmated, whereby excellent electrical connections may readily be effected and the balancing of` parts facilitated. Considerable diiculty has heretofore been experienced in connection with ,squirrel-cage secondaries of relatively small induction motors by reason of the fact that the electrical connections between and their short-circuiting end rings were relatively poor. f

DAccording to my present invention, I provide a rotatable core member having a plurality of substantially cylindrical slots that are preferably skewed relative to the axis of rotation and certain tubular conductors the ends of which project through holes-in conducting end rings and are upset or expanded. With this construction, it is ossibleto assemble and balance a rotata member `with a minimum amount of labor, since rods maybe inserted in certain of the tubular conductors for balancing purposes.

Figuiel, of the accompanying drawings, is .an end elevation of a dynamo-electric machine constructed in accordance with my invention and Fig. 2 is a side elevation of the secondary member shown in Fig. l'.

Referring to the drawings, the motor comprises a stationary supporting frame 1, a core member 2 having a plurality of slots 3 and secured to the frame and a rotatable secondmember 7 composed of -a lplurality of inag- ,netizable plates assembled on the spider 6.

the conducting part-sL le secondary The core member 7 is provided with aplu rality lof substantially cylindrical slots 8, that are preferablyskewed, relative to the axis and contain tubular conductors 9. The tubular conductors 9 project through holes in a pairof short-circuiting end rings 10 and their ends are upset or expanded against the outer faces of the rings to make good electrical connections and also clamp the laminas of the core structure together.

In order to .balance the rotating part after i it is completed, rods 11 may be inserted in certain of the tubular conductors, thereby avoiding the labor of drilling holes in the spider and filling them with Babbitt metal, as has been the usualpractice.

The tubular form of conductors, utilized as above indicated., is particularly well adapted for very small induction motors, but its application is not restricted in this regard, and I desire that only such limitations be imposed as are indicated in the appended claims. y.

I claim as my invention: A i v l. In a dynamo-electric iachine, the combination with stationary and rotatable core members, one of which-is provided with cy liiidrical slots, of tubular conductorsglocated in said slots, shoit-circuiting end rings into which the conductors are expanded, and one or more balancing rods located in one or more of-.said tubular conductors. y t

2. In an induction motor, the combination with a rotatable secondary core member having a plurality of cylindrical slots that are skewed relative to its axis of rotation, of tubular coiiduetorscin said slots, short-circuiting end rings into which said conduc# tors are expanded, and one or more balancing rods located in one or more ofethe tubular conductors.

3l A secondary member for an induction motor having tubular conductors that are angularly disposed with reference to its axis 'and balancing rods located in certain 'of the tubular conductors.

In testimony whereof, I have hereunto subi scribed my name this 6th day of July, 190i?.

THEODORE ABTMEYER. VVitnessesiv l J. R. BAcirorEN, BIRNEY Hiiaiis.4

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